Hexagon: Add signal functions

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/hexagon/kernel/trampoline.S b/arch/hexagon/kernel/trampoline.S
new file mode 100644
index 000000000000..06c36c036b98
--- /dev/null
+++ b/arch/hexagon/kernel/trampoline.S
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * Trampoline sequences to be copied onto user stack.
+ * This consumes a little more space than hand-assembling
+ * immediate constants for use in C, but is more portable
+ * to future tweaks to the Hexagon instruction set.
+ */
+
+#include <asm/unistd.h>
+
+/*  Sig trampolines - call sys_sigreturn or sys_rt_sigreturn as appropriate */
+
+/*  plain sigreturn is gone.  */
+
+	.globl __rt_sigtramp_template
+__rt_sigtramp_template:
+	r6 = #__NR_rt_sigreturn;
+	trap0(#1);